There are 3 books in the Mrs. Smith's Spy School for Girls series.
The Mrs. Smith's Spy School for Girls series does not have a new book coming out soon. The latest book, Double Cross (Book 3), was published in August 2019.
The first book in the Mrs. Smith's Spy School for Girls series, Mrs. Smith's Spy School for Girls, was published in July 2017.
The Mrs. Smith's Spy School for Girls series primarily falls into the Action Adventure and Espionage / Spies / CIA genres. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.